CVE-2026-44837 json
view_component: System Test Entry Point Path Check Allows Sibling Directory Escape
published 2026-05-08 6 mo ago modified 2026-09-10 1 mo ago also GHSA-hg3h-g7xc-f7vp , EUVD-2026-31971
- cvss
- 5.9
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 35%
- public exploits
- 0
- none known
Summary
view_component is a framework for building reusable, testable, and encapsulated view components in Ruby on Rails. From 3.0.0 to 4.9.0, the system test entrypoint canonicalizes a user-controlled file path with File.realpath, then checks whether the resolved path starts with the temp directory path. This is not a safe containment check because sibling directories can share the same string prefix. This vulnerability is fixed in 4.9.0.
Patch / fix
- rubygems view_component 4.9.0
- viewcomponent view_component 4.9.0
- ruby-view-component Debian 14 4.12.0-1
debian advisories DEBIAN-CVE-2026-44837
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5 mo ago
Exploit prediction
0.41% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/ViewComponent/view_component/security/advisories/GHSA-hg3h-g7xc-f7vp referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| GitHub | 3.1 | 5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| rubygems | view_component | >=3.0.0, <4.9.0 |
4.9.0 |
Affected products
- ViewComponent view_component
Classification
References
-
github.com
/ViewComponent/view_component/security/advisories/GHSA-hg3h-g7xc-f7vp
exploit, web, mitigation, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-44837
advisory
-
github.com
/ViewComponent/view_component
package
-
github.com
/rubysec/ruby-advisory-db/blob/master/gems/view_component/CVE-2026-44837.yml
web
Sources
- CVE List CVE-2026-44837
- GitHub Advisory GHSA-hg3h-g7xc-f7vp
- NVD CVE-2026-44837
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